release/src/router/openssl/crypto/rsa/rsa_pmeth.c

   1 /* crypto/rsa/rsa_pmeth.c */
   2 /*
   3  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
   4  * 2006.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59
  60 #include <stdio.h>
  61 #include "cryptlib.h"
  62 #include <openssl/asn1t.h>
  63 #include <openssl/x509.h>
  64 #include <openssl/rsa.h>
  65 #include <openssl/bn.h>
  66 #include <openssl/evp.h>
  67 #include <openssl/x509v3.h>
  68 #ifndef OPENSSL_NO_CMS
  69 # include <openssl/cms.h>
  70 #endif
  71 #ifdef OPENSSL_FIPS
  72 # include <openssl/fips.h>
  73 #endif
  74 #include "evp_locl.h"
  75 #include "rsa_locl.h"
  76
  77 /* RSA pkey context structure */
  78
  79 typedef struct {
  80     /* Key gen parameters */
  81     int nbits;
  82     BIGNUM *pub_exp;
  83     /* Keygen callback info */
  84     int gentmp[2];
  85     /* RSA padding mode */
  86     int pad_mode;
  87     /* message digest */
  88     const EVP_MD *md;
  89     /* message digest for MGF1 */
  90     const EVP_MD *mgf1md;
  91     /* PSS salt length */
  92     int saltlen;
  93     /* Temp buffer */
  94     unsigned char *tbuf;
  95     /* OAEP label */
  96     unsigned char *oaep_label;
  97     size_t oaep_labellen;
  98 } RSA_PKEY_CTX;
  99
 100 static int pkey_rsa_init(EVP_PKEY_CTX *ctx)
 101 {
 102     RSA_PKEY_CTX *rctx;
 103     rctx = OPENSSL_malloc(sizeof(RSA_PKEY_CTX));
 104     if (!rctx)
 105         return 0;
 106     rctx->nbits = 1024;
 107     rctx->pub_exp = NULL;
 108     rctx->pad_mode = RSA_PKCS1_PADDING;
 109     rctx->md = NULL;
 110     rctx->mgf1md = NULL;
 111     rctx->tbuf = NULL;
 112
 113     rctx->saltlen = -2;
 114
 115     rctx->oaep_label = NULL;
 116     rctx->oaep_labellen = 0;
 117
 118     ctx->data = rctx;
 119     ctx->keygen_info = rctx->gentmp;
 120     ctx->keygen_info_count = 2;
 121
 122     return 1;
 123 }
 124
 125 static int pkey_rsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
 126 {
 127     RSA_PKEY_CTX *dctx, *sctx;
 128     if (!pkey_rsa_init(dst))
 129         return 0;
 130     sctx = src->data;
 131     dctx = dst->data;
 132     dctx->nbits = sctx->nbits;
 133     if (sctx->pub_exp) {
 134         dctx->pub_exp = BN_dup(sctx->pub_exp);
 135         if (!dctx->pub_exp)
 136             return 0;
 137     }
 138     dctx->pad_mode = sctx->pad_mode;
 139     dctx->md = sctx->md;
 140     dctx->mgf1md = sctx->mgf1md;
 141     if (sctx->oaep_label) {
 142         if (dctx->oaep_label)
 143             OPENSSL_free(dctx->oaep_label);
 144         dctx->oaep_label = BUF_memdup(sctx->oaep_label, sctx->oaep_labellen);
 145         if (!dctx->oaep_label)
 146             return 0;
 147         dctx->oaep_labellen = sctx->oaep_labellen;
 148     }
 149     return 1;
 150 }
 151
 152 static int setup_tbuf(RSA_PKEY_CTX *ctx, EVP_PKEY_CTX *pk)
 153 {
 154     if (ctx->tbuf)
 155         return 1;
 156     ctx->tbuf = OPENSSL_malloc(EVP_PKEY_size(pk->pkey));
 157     if (!ctx->tbuf)
 158         return 0;
 159     return 1;
 160 }
 161
 162 static void pkey_rsa_cleanup(EVP_PKEY_CTX *ctx)
 163 {
 164     RSA_PKEY_CTX *rctx = ctx->data;
 165     if (rctx) {
 166         if (rctx->pub_exp)
 167             BN_free(rctx->pub_exp);
 168         if (rctx->tbuf)
 169             OPENSSL_free(rctx->tbuf);
 170         if (rctx->oaep_label)
 171             OPENSSL_free(rctx->oaep_label);
 172         OPENSSL_free(rctx);
 173     }
 174 }
 175
 176 #ifdef OPENSSL_FIPS
 177 /*
 178  * FIP checker. Return value indicates status of context parameters: 1 :
 179  * redirect to FIPS. 0 : don't redirect to FIPS. -1 : illegal operation in
 180  * FIPS mode.
 181  */
 182
 183 static int pkey_fips_check_ctx(EVP_PKEY_CTX *ctx)
 184 {
 185     RSA_PKEY_CTX *rctx = ctx->data;
 186     RSA *rsa = ctx->pkey->pkey.rsa;
 187     int rv = -1;
 188     if (!FIPS_mode())
 189         return 0;
 190     if (rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)
 191         rv = 0;
 192     if (!(rsa->meth->flags & RSA_FLAG_FIPS_METHOD) && rv)
 193         return -1;
 194     if (rctx->md) {
 195         const EVP_MD *fmd;
 196         fmd = FIPS_get_digestbynid(EVP_MD_type(rctx->md));
 197         if (!fmd || !(fmd->flags & EVP_MD_FLAG_FIPS))
 198             return rv;
 199     }
 200     if (rctx->mgf1md && !(rctx->mgf1md->flags & EVP_MD_FLAG_FIPS)) {
 201         const EVP_MD *fmd;
 202         fmd = FIPS_get_digestbynid(EVP_MD_type(rctx->mgf1md));
 203         if (!fmd || !(fmd->flags & EVP_MD_FLAG_FIPS))
 204             return rv;
 205     }
 206     return 1;
 207 }
 208 #endif
 209
 210 static int pkey_rsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig,
 211                          size_t *siglen, const unsigned char *tbs,
 212                          size_t tbslen)
 213 {
 214     int ret;
 215     RSA_PKEY_CTX *rctx = ctx->data;
 216     RSA *rsa = ctx->pkey->pkey.rsa;
 217
 218 #ifdef OPENSSL_FIPS
 219     ret = pkey_fips_check_ctx(ctx);
 220     if (ret < 0) {
 221         RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_OPERATION_NOT_ALLOWED_IN_FIPS_MODE);
 222         return -1;
 223     }
 224 #endif
 225
 226     if (rctx->md) {
 227         if (tbslen != (size_t)EVP_MD_size(rctx->md)) {
 228             RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_INVALID_DIGEST_LENGTH);
 229             return -1;
 230         }
 231 #ifdef OPENSSL_FIPS
 232         if (ret > 0) {
 233             unsigned int slen;
 234             ret = FIPS_rsa_sign_digest(rsa, tbs, tbslen, rctx->md,
 235                                        rctx->pad_mode,
 236                                        rctx->saltlen,
 237                                        rctx->mgf1md, sig, &slen);
 238             if (ret > 0)
 239                 *siglen = slen;
 240             else
 241                 *siglen = 0;
 242             return ret;
 243         }
 244 #endif
 245
 246         if (EVP_MD_type(rctx->md) == NID_mdc2) {
 247             unsigned int sltmp;
 248             if (rctx->pad_mode != RSA_PKCS1_PADDING)
 249                 return -1;
 250             ret = RSA_sign_ASN1_OCTET_STRING(NID_mdc2,
 251                                              tbs, tbslen, sig, &sltmp, rsa);
 252
 253             if (ret <= 0)
 254                 return ret;
 255             ret = sltmp;
 256         } else if (rctx->pad_mode == RSA_X931_PADDING) {
 257             if ((size_t)EVP_PKEY_size(ctx->pkey) < tbslen + 1) {
 258                 RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_KEY_SIZE_TOO_SMALL);
 259                 return -1;
 260             }
 261             if (!setup_tbuf(rctx, ctx)) {
 262                 RSAerr(RSA_F_PKEY_RSA_SIGN, ERR_R_MALLOC_FAILURE);
 263                 return -1;
 264             }
 265             memcpy(rctx->tbuf, tbs, tbslen);
 266             rctx->tbuf[tbslen] = RSA_X931_hash_id(EVP_MD_type(rctx->md));
 267             ret = RSA_private_encrypt(tbslen + 1, rctx->tbuf,
 268                                       sig, rsa, RSA_X931_PADDING);
 269         } else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
 270             unsigned int sltmp;
 271             ret = RSA_sign(EVP_MD_type(rctx->md),
 272                            tbs, tbslen, sig, &sltmp, rsa);
 273             if (ret <= 0)
 274                 return ret;
 275             ret = sltmp;
 276         } else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
 277             if (!setup_tbuf(rctx, ctx))
 278                 return -1;
 279             if (!RSA_padding_add_PKCS1_PSS_mgf1(rsa,
 280                                                 rctx->tbuf, tbs,
 281                                                 rctx->md, rctx->mgf1md,
 282                                                 rctx->saltlen))
 283                 return -1;
 284             ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
 285                                       sig, rsa, RSA_NO_PADDING);
 286         } else
 287             return -1;
 288     } else
 289         ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
 290                                   rctx->pad_mode);
 291     if (ret < 0)
 292         return ret;
 293     *siglen = ret;
 294     return 1;
 295 }
 296
 297 static int pkey_rsa_verifyrecover(EVP_PKEY_CTX *ctx,
 298                                   unsigned char *rout, size_t *routlen,
 299                                   const unsigned char *sig, size_t siglen)
 300 {
 301     int ret;
 302     RSA_PKEY_CTX *rctx = ctx->data;
 303
 304     if (rctx->md) {
 305         if (rctx->pad_mode == RSA_X931_PADDING) {
 306             if (!setup_tbuf(rctx, ctx))
 307                 return -1;
 308             ret = RSA_public_decrypt(siglen, sig,
 309                                      rctx->tbuf, ctx->pkey->pkey.rsa,
 310                                      RSA_X931_PADDING);
 311             if (ret < 1)
 312                 return 0;
 313             ret--;
 314             if (rctx->tbuf[ret] != RSA_X931_hash_id(EVP_MD_type(rctx->md))) {
 315                 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
 316                        RSA_R_ALGORITHM_MISMATCH);
 317                 return 0;
 318             }
 319             if (ret != EVP_MD_size(rctx->md)) {
 320                 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
 321                        RSA_R_INVALID_DIGEST_LENGTH);
 322                 return 0;
 323             }
 324             if (rout)
 325                 memcpy(rout, rctx->tbuf, ret);
 326         } else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
 327             size_t sltmp;
 328             ret = int_rsa_verify(EVP_MD_type(rctx->md),
 329                                  NULL, 0, rout, &sltmp,
 330                                  sig, siglen, ctx->pkey->pkey.rsa);
 331             if (ret <= 0)
 332                 return 0;
 333             ret = sltmp;
 334         } else
 335             return -1;
 336     } else
 337         ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
 338                                  rctx->pad_mode);
 339     if (ret < 0)
 340         return ret;
 341     *routlen = ret;
 342     return 1;
 343 }
 344
 345 static int pkey_rsa_verify(EVP_PKEY_CTX *ctx,
 346                            const unsigned char *sig, size_t siglen,
 347                            const unsigned char *tbs, size_t tbslen)
 348 {
 349     RSA_PKEY_CTX *rctx = ctx->data;
 350     RSA *rsa = ctx->pkey->pkey.rsa;
 351     size_t rslen;
 352 #ifdef OPENSSL_FIPS
 353     int rv;
 354     rv = pkey_fips_check_ctx(ctx);
 355     if (rv < 0) {
 356         RSAerr(RSA_F_PKEY_RSA_VERIFY,
 357                RSA_R_OPERATION_NOT_ALLOWED_IN_FIPS_MODE);
 358         return -1;
 359     }
 360 #endif
 361     if (rctx->md) {
 362 #ifdef OPENSSL_FIPS
 363         if (rv > 0) {
 364             return FIPS_rsa_verify_digest(rsa,
 365                                           tbs, tbslen,
 366                                           rctx->md,
 367                                           rctx->pad_mode,
 368                                           rctx->saltlen,
 369                                           rctx->mgf1md, sig, siglen);
 370
 371         }
 372 #endif
 373         if (rctx->pad_mode == RSA_PKCS1_PADDING)
 374             return RSA_verify(EVP_MD_type(rctx->md), tbs, tbslen,
 375                               sig, siglen, rsa);
 376         if (rctx->pad_mode == RSA_X931_PADDING) {
 377             if (pkey_rsa_verifyrecover(ctx, NULL, &rslen, sig, siglen) <= 0)
 378                 return 0;
 379         } else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
 380             int ret;
 381             if (!setup_tbuf(rctx, ctx))
 382                 return -1;
 383             ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
 384                                      rsa, RSA_NO_PADDING);
 385             if (ret <= 0)
 386                 return 0;
 387             ret = RSA_verify_PKCS1_PSS_mgf1(rsa, tbs,
 388                                             rctx->md, rctx->mgf1md,
 389                                             rctx->tbuf, rctx->saltlen);
 390             if (ret <= 0)
 391                 return 0;
 392             return 1;
 393         } else
 394             return -1;
 395     } else {
 396         if (!setup_tbuf(rctx, ctx))
 397             return -1;
 398         rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf,
 399                                    rsa, rctx->pad_mode);
 400         if (rslen == 0)
 401             return 0;
 402     }
 403
 404     if ((rslen != tbslen) || memcmp(tbs, rctx->tbuf, rslen))
 405         return 0;
 406
 407     return 1;
 408
 409 }
 410
 411 static int pkey_rsa_encrypt(EVP_PKEY_CTX *ctx,
 412                             unsigned char *out, size_t *outlen,
 413                             const unsigned char *in, size_t inlen)
 414 {
 415     int ret;
 416     RSA_PKEY_CTX *rctx = ctx->data;
 417     if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
 418         int klen = RSA_size(ctx->pkey->pkey.rsa);
 419         if (!setup_tbuf(rctx, ctx))
 420             return -1;
 421         if (!RSA_padding_add_PKCS1_OAEP_mgf1(rctx->tbuf, klen,
 422                                              in, inlen,
 423                                              rctx->oaep_label,
 424                                              rctx->oaep_labellen,
 425                                              rctx->md, rctx->mgf1md))
 426             return -1;
 427         ret = RSA_public_encrypt(klen, rctx->tbuf, out,
 428                                  ctx->pkey->pkey.rsa, RSA_NO_PADDING);
 429     } else
 430         ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
 431                                  rctx->pad_mode);
 432     if (ret < 0)
 433         return ret;
 434     *outlen = ret;
 435     return 1;
 436 }
 437
 438 static int pkey_rsa_decrypt(EVP_PKEY_CTX *ctx,
 439                             unsigned char *out, size_t *outlen,
 440                             const unsigned char *in, size_t inlen)
 441 {
 442     int ret;
 443     RSA_PKEY_CTX *rctx = ctx->data;
 444     if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
 445         int i;
 446         if (!setup_tbuf(rctx, ctx))
 447             return -1;
 448         ret = RSA_private_decrypt(inlen, in, rctx->tbuf,
 449                                   ctx->pkey->pkey.rsa, RSA_NO_PADDING);
 450         if (ret <= 0)
 451             return ret;
 452         for (i = 0; i < ret; i++) {
 453             if (rctx->tbuf[i])
 454                 break;
 455         }
 456         ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, ret, rctx->tbuf + i,
 457                                                 ret - i, ret,
 458                                                 rctx->oaep_label,
 459                                                 rctx->oaep_labellen,
 460                                                 rctx->md, rctx->mgf1md);
 461     } else
 462         ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
 463                                   rctx->pad_mode);
 464     if (ret < 0)
 465         return ret;
 466     *outlen = ret;
 467     return 1;
 468 }
 469
 470 static int check_padding_md(const EVP_MD *md, int padding)
 471 {
 472     if (!md)
 473         return 1;
 474
 475     if (padding == RSA_NO_PADDING) {
 476         RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_PADDING_MODE);
 477         return 0;
 478     }
 479
 480     if (padding == RSA_X931_PADDING) {
 481         if (RSA_X931_hash_id(EVP_MD_type(md)) == -1) {
 482             RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_X931_DIGEST);
 483             return 0;
 484         }
 485         return 1;
 486     }
 487
 488     return 1;
 489 }
 490
 491 static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 492 {
 493     RSA_PKEY_CTX *rctx = ctx->data;
 494     switch (type) {
 495     case EVP_PKEY_CTRL_RSA_PADDING:
 496         if ((p1 >= RSA_PKCS1_PADDING) && (p1 <= RSA_PKCS1_PSS_PADDING)) {
 497             if (!check_padding_md(rctx->md, p1))
 498                 return 0;
 499             if (p1 == RSA_PKCS1_PSS_PADDING) {
 500                 if (!(ctx->operation &
 501                       (EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)))
 502                     goto bad_pad;
 503                 if (!rctx->md)
 504                     rctx->md = EVP_sha1();
 505             }
 506             if (p1 == RSA_PKCS1_OAEP_PADDING) {
 507                 if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
 508                     goto bad_pad;
 509                 if (!rctx->md)
 510                     rctx->md = EVP_sha1();
 511             }
 512             rctx->pad_mode = p1;
 513             return 1;
 514         }
 515  bad_pad:
 516         RSAerr(RSA_F_PKEY_RSA_CTRL,
 517                RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
 518         return -2;
 519
 520     case EVP_PKEY_CTRL_GET_RSA_PADDING:
 521         *(int *)p2 = rctx->pad_mode;
 522         return 1;
 523
 524     case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
 525     case EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN:
 526         if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING) {
 527             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
 528             return -2;
 529         }
 530         if (type == EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN)
 531             *(int *)p2 = rctx->saltlen;
 532         else {
 533             if (p1 < -2)
 534                 return -2;
 535             rctx->saltlen = p1;
 536         }
 537         return 1;
 538
 539     case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
 540         if (p1 < 256) {
 541             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_KEYBITS);
 542             return -2;
 543         }
 544         rctx->nbits = p1;
 545         return 1;
 546
 547     case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
 548         if (!p2)
 549             return -2;
 550         BN_free(rctx->pub_exp);
 551         rctx->pub_exp = p2;
 552         return 1;
 553
 554     case EVP_PKEY_CTRL_RSA_OAEP_MD:
 555     case EVP_PKEY_CTRL_GET_RSA_OAEP_MD:
 556         if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 557             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
 558             return -2;
 559         }
 560         if (type == EVP_PKEY_CTRL_GET_RSA_OAEP_MD)
 561             *(const EVP_MD **)p2 = rctx->md;
 562         else
 563             rctx->md = p2;
 564         return 1;
 565
 566     case EVP_PKEY_CTRL_MD:
 567         if (!check_padding_md(p2, rctx->pad_mode))
 568             return 0;
 569         rctx->md = p2;
 570         return 1;
 571
 572     case EVP_PKEY_CTRL_GET_MD:
 573         *(const EVP_MD **)p2 = rctx->md;
 574         return 1;
 575
 576     case EVP_PKEY_CTRL_RSA_MGF1_MD:
 577     case EVP_PKEY_CTRL_GET_RSA_MGF1_MD:
 578         if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING
 579             && rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 580             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_MGF1_MD);
 581             return -2;
 582         }
 583         if (type == EVP_PKEY_CTRL_GET_RSA_MGF1_MD) {
 584             if (rctx->mgf1md)
 585                 *(const EVP_MD **)p2 = rctx->mgf1md;
 586             else
 587                 *(const EVP_MD **)p2 = rctx->md;
 588         } else
 589             rctx->mgf1md = p2;
 590         return 1;
 591
 592     case EVP_PKEY_CTRL_RSA_OAEP_LABEL:
 593         if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 594             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
 595             return -2;
 596         }
 597         if (rctx->oaep_label)
 598             OPENSSL_free(rctx->oaep_label);
 599         if (p2 && p1 > 0) {
 600             rctx->oaep_label = p2;
 601             rctx->oaep_labellen = p1;
 602         } else {
 603             rctx->oaep_label = NULL;
 604             rctx->oaep_labellen = 0;
 605         }
 606         return 1;
 607
 608     case EVP_PKEY_CTRL_GET_RSA_OAEP_LABEL:
 609         if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 610             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
 611             return -2;
 612         }
 613         *(unsigned char **)p2 = rctx->oaep_label;
 614         return rctx->oaep_labellen;
 615
 616     case EVP_PKEY_CTRL_DIGESTINIT:
 617     case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
 618     case EVP_PKEY_CTRL_PKCS7_DECRYPT:
 619     case EVP_PKEY_CTRL_PKCS7_SIGN:
 620         return 1;
 621 #ifndef OPENSSL_NO_CMS
 622     case EVP_PKEY_CTRL_CMS_DECRYPT:
 623     case EVP_PKEY_CTRL_CMS_ENCRYPT:
 624     case EVP_PKEY_CTRL_CMS_SIGN:
 625         return 1;
 626 #endif
 627     case EVP_PKEY_CTRL_PEER_KEY:
 628         RSAerr(RSA_F_PKEY_RSA_CTRL,
 629                RSA_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 630         return -2;
 631
 632     default:
 633         return -2;
 634
 635     }
 636 }
 637
 638 static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
 639                              const char *type, const char *value)
 640 {
 641     if (!value) {
 642         RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_VALUE_MISSING);
 643         return 0;
 644     }
 645     if (!strcmp(type, "rsa_padding_mode")) {
 646         int pm;
 647         if (!strcmp(value, "pkcs1"))
 648             pm = RSA_PKCS1_PADDING;
 649         else if (!strcmp(value, "sslv23"))
 650             pm = RSA_SSLV23_PADDING;
 651         else if (!strcmp(value, "none"))
 652             pm = RSA_NO_PADDING;
 653         else if (!strcmp(value, "oeap"))
 654             pm = RSA_PKCS1_OAEP_PADDING;
 655         else if (!strcmp(value, "oaep"))
 656             pm = RSA_PKCS1_OAEP_PADDING;
 657         else if (!strcmp(value, "x931"))
 658             pm = RSA_X931_PADDING;
 659         else if (!strcmp(value, "pss"))
 660             pm = RSA_PKCS1_PSS_PADDING;
 661         else {
 662             RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_UNKNOWN_PADDING_TYPE);
 663             return -2;
 664         }
 665         return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
 666     }
 667
 668     if (!strcmp(type, "rsa_pss_saltlen")) {
 669         int saltlen;
 670         saltlen = atoi(value);
 671         return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
 672     }
 673
 674     if (!strcmp(type, "rsa_keygen_bits")) {
 675         int nbits;
 676         nbits = atoi(value);
 677         return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
 678     }
 679
 680     if (!strcmp(type, "rsa_keygen_pubexp")) {
 681         int ret;
 682         BIGNUM *pubexp = NULL;
 683         if (!BN_asc2bn(&pubexp, value))
 684             return 0;
 685         ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp);
 686         if (ret <= 0)
 687             BN_free(pubexp);
 688         return ret;
 689     }
 690
 691     if (!strcmp(type, "rsa_mgf1_md")) {
 692         const EVP_MD *md;
 693         if (!(md = EVP_get_digestbyname(value))) {
 694             RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_INVALID_DIGEST);
 695             return 0;
 696         }
 697         return EVP_PKEY_CTX_set_rsa_mgf1_md(ctx, md);
 698     }
 699
 700     if (!strcmp(type, "rsa_oaep_md")) {
 701         const EVP_MD *md;
 702         if (!(md = EVP_get_digestbyname(value))) {
 703             RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_INVALID_DIGEST);
 704             return 0;
 705         }
 706         return EVP_PKEY_CTX_set_rsa_oaep_md(ctx, md);
 707     }
 708     if (!strcmp(type, "rsa_oaep_label")) {
 709         unsigned char *lab;
 710         long lablen;
 711         int ret;
 712         lab = string_to_hex(value, &lablen);
 713         if (!lab)
 714             return 0;
 715         ret = EVP_PKEY_CTX_set0_rsa_oaep_label(ctx, lab, lablen);
 716         if (ret <= 0)
 717             OPENSSL_free(lab);
 718         return ret;
 719     }
 720
 721     return -2;
 722 }
 723
 724 static int pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 725 {
 726     RSA *rsa = NULL;
 727     RSA_PKEY_CTX *rctx = ctx->data;
 728     BN_GENCB *pcb, cb;
 729     int ret;
 730     if (!rctx->pub_exp) {
 731         rctx->pub_exp = BN_new();
 732         if (!rctx->pub_exp || !BN_set_word(rctx->pub_exp, RSA_F4))
 733             return 0;
 734     }
 735     rsa = RSA_new();
 736     if (!rsa)
 737         return 0;
 738     if (ctx->pkey_gencb) {
 739         pcb = &cb;
 740         evp_pkey_set_cb_translate(pcb, ctx);
 741     } else
 742         pcb = NULL;
 743     ret = RSA_generate_key_ex(rsa, rctx->nbits, rctx->pub_exp, pcb);
 744     if (ret > 0)
 745         EVP_PKEY_assign_RSA(pkey, rsa);
 746     else
 747         RSA_free(rsa);
 748     return ret;
 749 }
 750
 751 const EVP_PKEY_METHOD rsa_pkey_meth = {
 752     EVP_PKEY_RSA,
 753     EVP_PKEY_FLAG_AUTOARGLEN,
 754     pkey_rsa_init,
 755     pkey_rsa_copy,
 756     pkey_rsa_cleanup,
 757
 758     0, 0,
 759
 760     0,
 761     pkey_rsa_keygen,
 762
 763     0,
 764     pkey_rsa_sign,
 765
 766     0,
 767     pkey_rsa_verify,
 768
 769     0,
 770     pkey_rsa_verifyrecover,
 771
 772     0, 0, 0, 0,
 773
 774     0,
 775     pkey_rsa_encrypt,
 776
 777     0,
 778     pkey_rsa_decrypt,
 779
 780     0, 0,
 781
 782     pkey_rsa_ctrl,
 783     pkey_rsa_ctrl_str
 784 };